Personally have used Autotrader and lately cargurus...cargurus is dirt cheap, like $5 for the Ad...crazy. But get a lot of activity when using these and sell all my cars via private sale I own. I never trade anything in, get more money via private sell, but of course takes longer. My car I put up recently got action/interest in days from many people from both sites. As mentioned, plenty of places people use/look when trying to find a private vehicle. Good luck.